linux-kernel - Re: [PATCH 3/3] drivers core: allow id match override when manually binding driver

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Date:	Sat, 25 Jun 2016 21:14:35 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Adrien Schildknecht <adrien+dev@...ischi.me>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-spi@...r.kernel.org
Subject: Re: [PATCH 3/3] drivers core: allow id match override when manually
 binding driver

On Thu, Jun 23, 2016 at 10:41 AM, Michal Suchanek <hramrach@...il.com> wrote:
> This allows binding spidev on any slave device by hand using sysfs
> without adding superfluous compatibles or any other needless
> complication.
>
> Note that any slave driver that requires configuration will fail to
> probe anyway. Only a driver that binds to anything can be bound
> successfully.
>
> Signed-off-by: Michal Suchanek <hramrach@...il.com>
> ---
>  drivers/base/Kconfig.debug | 14 +++++++++
>  drivers/base/bus.c         | 72 +++++++++++++++++++++++++++++++++++++++++++++-
>  lib/Kconfig.debug          |  2 ++
>  3 files changed, 87 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/base/Kconfig.debug
>

Why change the driver core?  The matching policy can be changed with
the "match" operation of a custom "struct bus_type".